Hearing aid



FIG. 1 is a front perspective view of a hearing aid of the present invention;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a first side view thereof;

FIG. 6 is a second side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

We claim the ornamental design for a hearing aid, as shown and described. 